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index.html
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<!DOCTYPE html>
<html>
<head>
<title>Currency Converter in Javascript</title>
<link
rel="stylesheet"
href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
/>
</head>
<body>
<h1 class="text-center">Youtube Thumbnail Grabber</h1>
<form id="form">
<div class="form-group">
<input type="text" id="url" placeholder="Enter youtube video url" required class="form-control">
</div>
<div class="form-group">
<button type="submit" class="btn btn-danger btn-block">Get Thumbnail Image</button>
</div>
</form>
<div id="result">
</div>
</body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script>
$("#form").submit(function(e){
e.preventDefault()
var url = $("#url").val()
// quality options: low, medium, high, max | default is max.
var thumbnail = get_youtube_thumbnail(url, 'max');
console.log(thumbnail);
$("#result").html(`
<img src="${thumbnail}"/>
`)
})
function get_youtube_thumbnail(url, quality){
if(url){
var video_id, thumbnail, result;
if(result = url.match(/youtube\.com.*(\?v=|\/embed\/)(.{11})/))
{
video_id = result.pop();
}
else if(result = url.match(/youtu.be\/(.{11})/))
{
video_id = result.pop();
}
if(video_id){
if(typeof quality == "undefined"){
quality = 'high';
}
var quality_key = 'maxresdefault'; // Max quality
if(quality == 'low'){
quality_key = 'sddefault';
}else if(quality == 'medium'){
quality_key = 'mqdefault';
} else if (quality == 'high') {
quality_key = 'hqdefault';
}
var thumbnail = "http://img.youtube.com/vi/"+video_id+"/"+quality_key+".jpg";
return thumbnail;
}
}
return false;
}
</script>
</html>